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Method for producing sodium 2-hydroxy-6-naphthalene sulfonate

A technology of sodium naphthalenesulfonate and production method, which is applied in the field of chemical industry, can solve the problems of high cost, difficult operation, unfavorable industrial production and other problems of the synthetic method, and achieve the effects of low cost, advanced and simple, significant economic and social benefits

Active Publication Date: 2014-04-02
ZAOZHUANG TAIRUI FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the traditional production of 2-hydroxyl-6-naphthalenesulfonate using 2-hydroxyl as a starting material has a high cost and is not easy to operate, and produces a large amount of waste acid and waste water, which is not conducive to industrialization Production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Step 1: Add 118Kg sodium hydroxide and 60Kg water into the autoclave, stir and dissolve, then add 320Kg of 95% sodium 2.6-naphthalene disulfonate and stir evenly;

[0014] Step 2: heat up to 230°C for 8 hours;

[0015] Step 3: After cooling down the solution in the autoclave to 95°C, add 600Kg of water for hydrolysis;

[0016] Step 4: Acidify the above solution with 98% sulfuric acid to a pH value of 4, cool down to 30°C and centrifuge to obtain 307Kg of crude sodium 2-hydroxy-6-naphthalenesulfonate with a purity of 88.8%;

[0017] Step 5: add 800Kg of water to the crude sodium 2-hydroxy-6-naphthalenesulfonate, heat it at 90°C for decolorization and filtration, centrifuge and dry to obtain 94Kg of sodium 2-hydroxy-6-naphthalenesulfonate with a purity of 99.5%.

Embodiment 2

[0019] Step 1: Add 120Kg sodium hydroxide and 60Kg water into the autoclave, stir and dissolve, then add 330Kg of 95% sodium 2.6-naphthalene disulfonate and stir evenly;

[0020] Step 2: heat up to 230°C for 8 hours;

[0021] Step 3: After cooling down the solution in the autoclave to 100°C, add 610Kg of water for hydrolysis;

[0022] Step 4: acidify the above solution with 98% sulfuric acid to a pH value of 3, cool down to 25°C and centrifuge to obtain 309Kg of crude sodium 2-hydroxy-6-naphthalenesulfonate with a purity of 85.3%;

[0023] Step 5: Add 800Kg of water to the above crude sodium 2-hydroxy-6-naphthalenesulfonate, heat it at 90°C for decolorization and filtration, centrifuge at lower temperature, and dry to obtain 96Kg of sodium 2-hydroxy-6-naphthalenesulfonate product with a purity of 99.2%.

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PUM

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Abstract

The invention discloses a method for producing sodium 2-hydroxy-6-naphthalene sulfonate. The method comprises the following steps: adding 118-120 kg of sodium hydroxide and 60 kg of water into an autoclave, stirring to dissolve, then adding 320-330 kg of sodium 2,6-naphthalene disulfonate with the content of 95%, and stirring uniformly; heating up to 230 DEG C, and holding for 8 hours; reducing the temperature of the solution in the autoclave to 95-100 DEG C, adding 600-610 kg of water, and hydrolyzing; and acidizing the solution with a 98% sulfuric acid until the pH value is 3-4, reducing the temperature to 25-30 DEG C, and centrifuging to obtain 307-309 kg of a sodium 2-hydroxy-6-naphthalene sulfonate crude product with the purity of 85.3%-88.8%. The method is simple in process, low in cost, and easy to operate.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a production method of sodium 2-hydroxy-6-naphthalenesulfonate. Background technique [0002] 2-Hydroxy-6-naphthalene sodium sulfonate is a very important fine chemical product, and it is a raw material for preparing azo dyes or other dye intermediates. Due to the gradual increase in the development and application of its downstream products, the application field of this product in the chemical industry is constantly expanding. [0003] In the prior art, the traditional production of 2-hydroxyl-6-naphthalenesulfonate using 2-hydroxyl as a starting material has a high cost and is not easy to operate, and produces a large amount of waste acid and waste water, which is not conducive to industrialization Production. Contents of the invention [0004] For above-mentioned deficiencies in the prior art, the present invention provides a kind of production method of 2-hydroxyl-6-naph...

Claims

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Application Information

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IPC IPC(8): C07C309/43C07C303/32
Inventor 杨玉栋周志辉卢海伟赵明侠
Owner ZAOZHUANG TAIRUI FINE CHEM